The price of better insulation is paid back by the money saved in cooling and heating costs.  Making green choices in attic materials not only saves you money but can greatly reduce the off-gas of hazardous chemicals, such as formaldehyde, which is used as a binding agent in such common materials like fiberglass insulation.

Research Links

Solar Powered Attic Fans
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Green Insulation - Some Insulations Out-Green Others
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5 Great Green Indoor Climate Control Tips
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Ventilation
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